I really like this game, and the way the characters interact with each other with one glaring exception.
There are a few times where the writing makes it feel like these characters only interact with each other through the medium of texting. I get that you want to tell a story, but keep the medium in mind. What makes this story unique is that we only see snippets of it through texts.
You shouldn't put things in text the characters are likely to say to each other in person.
I include the detailed play-by-play sex scenes after the fact. These just don't really work in the medium you chose to convey the story. Instead, you should use what this medium does well - sexting. There are a bunch of characters we could have perspectives of- Laura, Ashley, Tara, Nathan etc.
Instead of waiting for a 'break' in the festivities to drop a novel, like in the very last scene (the one that's on my mind now), you have a perfect opportunity to have Ashley take pics, tease the protagonist and relate what she's seeing in real time - enhanced with pictures. She's right there! Use her.
This might be a personal taste thing, but 'live action' is always hotter than after-the-fact text dumping imo. I know this would cut into word count (if you're even concerned about that), but it would read better over the medium you chose to use to tell the story.
This came off as overly negative, I love the characters and the flavour of the kink you chose to portray, and the girls are cute. I'm enjoying this, mostly (even if my eyes glaze over at the walls of texts).